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The Hybrid encoder is trying to choose the better encoder between the Wavelet Difference Reduction (Type-W) and Simple Bit-plane (Type-B) to get the better results than pure Type-W or pure Type-B was proposed in previous research. In case that the most pixels are insignificant, Type-B will generate a long consecutive sequence of zero bits. By experimental results, the Modified Simple Bit-plane which...
Since wavelet-based image coding method suits digital image and video coding, it has been welcomed by video coding field. The BQ mode of MPEG-4's visual texture coding has adopted Predicative Embedded Zero-tree Wavelet Coding Algorithm (PEZW). Although in PEZW there is the germ of the unified scheme for fast EZW coding algorithm, it hasn't completely implemented the unified scheme. Thus, its algorithm...
Based on analyzing the algorithm of EZW, an improved image coding algorithm is presented. The wavelet coefficients are decomposed into two groups and coded separately. Meanwhile, the subordinate pass is removed and the location information of significant coefficients does not need to be kept in memory, So that the times of scan in the algorithm of the EZW are reduced. Thereby, the coding speed is...
In this paper, a new image compression algorithm based on decreasing bits coding, a conception of compression cell, and compression operator about a number of consecutive Z are put forward. The basic idea is as follows. First, wavelet coefficients, with adaptive threshold to determine the relationship are divided into three situations. They are positive P greater than or equal to the threshold, a...
Progressive wavelet coding of Images (PWC) is a simple and efficient image coding algorithm. It is comparable to the state-of-the-art SPIHT. It is based only on two concepts: (1) data-independent reordering and blocking, and (2) low-complexity independent encoding of each block via adaptive run-length/Rice coding of the bit planes. Therefore PWC allows for progressive image encoding that is scalable...
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